Installing specific old OpenShift Data Foundation z-version doesn't work. It's automatically updated to latest z-version

Issue

• Even if OpenShift Data Foundation is installed with startingCSV, the latest z-version is installed

  $ cat <<END | oc create -f -
  apiVersion: operators.coreos.com/v1alpha1
  kind: Subscription
  metadata:
    name: odf-operator
    namespace: openshift-storage
  spec:
    channel: stable-4.18
    installPlanApproval: Manual
    name: odf-operator
    source: redhat-operators
    sourceNamespace: openshift-marketplace
    startingCSV: odf-operator.v4.18.5-rhodf
  END
  
  $ oc patch installplan install-sxmfz --type merge     --patch '{"spec":{"approved":true}}'
  
    ===> Installing ODF 4.18.5
  
  $ oc get csv
  NAME                                    DISPLAY                            VERSION        REPLACES                                PHASE
  cephcsi-operator.v4.18.6-rhodf          CephCSI operator                   4.18.6-rhodf   cephcsi-operator.v4.18.5-rhodf          Succeeded
  mcg-operator.v4.18.6-rhodf              NooBaa Operator                    4.18.6-rhodf   mcg-operator.v4.18.5-rhodf              Succeeded
  ocs-client-operator.v4.18.6-rhodf       OpenShift Data Foundation Client   4.18.6-rhodf   ocs-client-operator.v4.18.5-rhodf       Succeeded
  ocs-operator.v4.18.6-rhodf              OpenShift Container Storage        4.18.6-rhodf   ocs-operator.v4.18.5-rhodf              Succeeded
  odf-csi-addons-operator.v4.18.6-rhodf   CSI Addons                         4.18.6-rhodf   odf-csi-addons-operator.v4.18.5-rhodf   Succeeded
  odf-dependencies.v4.18.6-rhodf          Data Foundation Dependencies       4.18.6-rhodf   odf-dependencies.v4.18.5-rhodf          Succeeded
  odf-operator.v4.18.6-rhodf              OpenShift Data Foundation          4.18.6-rhodf   odf-operator.v4.18.5-rhodf              Succeeded
  odf-prometheus-operator.v4.18.6-rhodf   Prometheus Operator                4.18.6-rhodf   odf-prometheus-operator.v4.18.5-rhodf   Succeeded
  recipe.v4.18.6-rhodf                    Recipe                             4.18.6-rhodf   recipe.v4.18.5-rhodf                    Succeeded
  rook-ceph-operator.v4.18.6-rhodf        Rook-Ceph                          4.18.6-rhodf   rook-ceph-operator.v4.18.5-rhodf        Succeeded
  
    ===> The latest ODF 4.18.z is installed. In this example, 4.18.6 is installed instead of 4.18.5
  

• The issue occurs even if OpenShift Data Foundation is installed via GUI dashboard